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worker: add mutex lock to MessagePort ctor #25911

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worker: add mutex lock to MessagePort ctor #25911

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5 changes: 5 additions & 0 deletions src/node_messaging.cc
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Original file line number Diff line number Diff line change
Expand Up @@ -533,6 +533,11 @@ MessagePort* MessagePort::New(
if (data) {
port->Detach();
port->data_ = std::move(data);

// This lock is here to avoid race conditions with the `owner_` read
// in AddToIncomingQueue(). (This would likely be unproblematic without it,
// but it's better to be safe than sorry.)
Mutex::ScopedLock lock(port->data_->mutex_);
port->data_->owner_ = port;
// If the existing MessagePortData object had pending messages, this is
// the easiest way to run that queue.
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